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Molecular Interactions and the Behaviors of Biological Macromolecules
| en español | Williams Home | Structure | Part 1. Molecular Interactions.
Molecular interactions are important in chemistry, biochemistry and biophysics, including protein folding, drug design, pathogen detection, materials science, sensors, nanotechnology, separations, origins of life, and gecko feet. Cation-Π interactions with benzeneIonΔH (kcal/mol)Li+-38Na+-28K+-19NH 4+-19(gas phase)A Π-system, such as that of benzene, tryptophan, phenylalanine or tyrosine, focuses partial negative charge above and below the plane of the aromatic ring. The four-center hydrogen bonding scheme on the right is observed in crystalline ammonium, where one acceptor lone pair has to accomodate three donors (see section on ammonia, below.
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